Lathe bed



Feb-. 1o. 1925.

1 1,526,241 F. SCHNEIDE R LATHE BED Filed March 2e, 1924 Patented Feb. 10, 1925.

UNITED STATES FRITZ SCHNEIDER, 0F MAGDEBURG, GERMANY.

LATIIE BED.

Application filed March 26, w24.` Serial No. 702,102.

To all whom 'it may concern.'

Be it known that I, FRITZ SCHNEIDER, citizen of theGerman Empire, residing at lifiagdeburg, Pfalzerstrasse 8, Germany, have invented certain new and useful Improvements in or Relatfng to Lathe Beds, of which the following is a specification. y

This invention relates to beds for lathes of various kinds. Existing lathes having flat guide paths or raised or sunk guide paths of prismatic shape or angular formation possess defects not only from a manu facturfng point of view but also in oonnection with the operation of the lathe as difficulty is experienced in keeping the guide surfaces free from turnings, shavings and filings. The advantage for a bed having so called A-prismatic guide path or inverted V slide namely that the turnings or the like slide off the guide surfaces is only partially true; the turnings or the like which collect on the bottom of the inverted V slide are just as troublesome as those which collect on a fl at bed. A proposed lathe. bed having inwardly inclined `guide surfaces closed at the lower part by the lead screw located in the centre of the bed and by the construction of the carriage did not facilitate the disposal or removal of the turnings but rendered it more difficult. It is the main object of the present invention to overcome the above lstated objections whilst retaining the advantages of existing bed constructions. This object is attained by so constructing the lathe bed as to form two inwardly inclined guide surfaces which if extended would meet or intersect on a line within the bed so as to provide a single prisinatic or angular path open at the bottom which in conjunction with the externally mounted feed shaft and leading screw Aconstitutes a kind of funnel-shaped trough that perm'ts of the turnings falling freely into and through the same. V

In order that the said invention may be clearly understood and readily carried into effect the same will now be described more fully with reference to the accompanying drawings, in which:

Figure 1 is a cross-sectional view through the cheeks of the lathe bed and the slide rest bridge or saddle according to one embodiment of the present invention.

Figure 2 is a cross-sectional view taken through the cheeks of the lathe bed and the lower part of the tail-stock.

The lathe bed is provided on both cheeks l with guide surfaces or slip faces 2 inclned inwardly towards the centre oft-he bed so that assuming these surfaces to be extended they would intersect or meet within the bed thus forming a single prismatic path which as shown is open at the bottom. In the construction illustrated the line of intersection would be disposed in the central plane of the hed and although this arrangement is not essential it isnevertheless advantageous. Owing to the form or shape of the cheeks of the lat-he bed as indicated by the reference letters c, f, g, h it is possible to provide a very robust construction of slide rest bridge or saddle. The saddle lugs 3 which bear only on the guide surfaces or slip faces 2 extend beyond and overhang the latter whilst clearance or play is provided between the straight surfaces indicated at 4 Aextending from the inclined guide surfaces and the saddle. On the said inclined guide surfaces, bearing parts or faces 5 and 6 are provided for the saddle whilst a space is formed in each inclined sli face to provide a path at the position in icated by 7 (see Fig. 2) for the tail-stock 8 so that the guide path for the tail-stock is separate from or independent of the guide path for the sad dle. This improved construction of the lathe bed affords the following advantages:

The prismatc guide path ensures that the saddle path is parallel with the central axis of the head-stock and the tail-stock and the wide guide paths afford large bearing surfaces and consequently reduce specific surface pressures. The turning pressures are taken up on both sides of the lathe bed at the most favourable angle to the resultant, and the turnings are directed into the bed without meeting any overhanging or obstructing surfaces. Owing to the troughlike shape of lathe bed it is possible to strengthen adequately the slide rest bridUe or saddle. The inwardly inclined gui e surfaces allow the turnings to fall freely through the open part of the funnel-shaped bed upon the 'collecting trays or the like. A further advantage is that during the casting of the lat-he bed no obstruction is offered to the rising gases and this is important especially in comparison with the type of bed upon which prismatic guide paths are mounted. The inclined surfaces can be just as easily treated on a grinding machine as the surfaces on the ordina-ry form of the flat bed. Further a greater turning diai'neter indicated by the radial line D is afforded as compared with the turning diameter indicated by the radial line l afforded by the usual construction of lathe bed indicated by the dotted lines in Figure l.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. A self-clean'ng lathe bed comprising parallelly spaced guide surfaces inclined relative to cach other to forni an open bottom trough, said guide surfaces serving to support slide-rest and to direct shavings and the like uniinpededly from the lathe bed, the feed shaft and leading screw being disposed at one side of said lathe bed.

2. A self-cleaning lathe bed comprising parallelly spaced guide surfaces convergent towards their lower edges to form an open bottom trough, said guide surfaces serving to support a slide-rest and to direct shavings and the like unimpededly through the free space existing between said surfaces, the feed shaft and leading screw being disposed at one side of said lathe bed.

3. A self-cleaning lathe bed comprising parallelly spaced guide surfaces convergent towards their lower edges to form an open bottom trough, said guide surfaces serving to support a slide-rest and to direct shavings and the like unimpededly through the free space existing between said surfaces7 the .feed shaft and leading screw being disposed at one side of said lathe bed, a path being provided for a tail-stock on sa'd guide surfaces separate from the path of the sliderest.

In testimony whereof the foregoing speciiication is signed in the presence of two witnesses.

FRITZ SCHNEIDER. ll'itnesses MAX ENDERS, RYN T. AUsPniN. 

